JPH0670468A - Uninterruptible current switching method and device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an uninterruptible current switching method and device capable of safely and easily performing replacement work of electrical equipment while the live wire condition is maintained. [Configuration] Uninterruptible current switching device 1 on the power supply side and load side
a, 1b, and 1c are provided, and the power source or the load and the PCT2 to be replaced are connected to the first and second terminals thereof. During normal operation, uninterruptible current switching devices 1a, 1b,
The movable conductor provided in 1c makes the first and second terminals conductive, and supplies power from the power source to the load side through the PCT 2 (FIG. A). When removing the PCT2, bypass the third terminal of the uninterruptible current switching devices 1a, 1b, 1c.
After connecting the cable 3 (Fig. B), the first and third terminals are connected by the movable conductor to form a current path from the power supply side to the bypass cable to the load side, and the PCT 2 is removed (Fig. c). In addition, the PCT is performed in the reverse order of the above.
2 can be attached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a voltage transformer (hereinafter referred to as PC
Uninterruptible current switching method and device that can remove and install electric equipment connected to a live line such as T) without interruption, and in particular, electric equipment connected to a live line can be safely operated without interruption. The present invention also relates to an uninterruptible current switching method and device that can be easily attached and detached.

[0002]

2. Description of the Related Art It is stipulated that electrical equipment such as PCTs installed in buildings, factories, etc. undergo regular inspections.
These electrical devices need to be removed and installed on a regular basis for certification. However,
In consumers such as buildings and factories, electric equipment such as PCT is installed in a compact cabinet where the high-voltage charging section and the ground section are close to each other. It is not possible to secure sufficient safety for removal and installation in.

For this reason, when removing or installing the above-mentioned electric equipment, conventionally, a customer has been requested to turn off the power, and a bypass path has been provided in the electric equipment to remove and install the electric equipment. .

[0004]

As described above, the PCT
When replacing electrical equipment such as, it is necessary to carry out the work in a power failure state, and the work is often a holiday. However, recently, while the number of high-voltage consumers has increased and the number of replacement works has increased, it has become difficult to secure workers on holidays.

Further, in recent years, the number of consumers using computers has increased, and it has become difficult to accept a power outage as in the past. The present invention has been made in view of the problems of the above-mentioned conventional techniques, and in a live state,
It is an object of the present invention to provide an uninterruptible current switching method and device capable of safely and easily replacing electric equipment.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is the first, second, and third, to which a power source side or a load side, an electric device, and a bypass cable are respectively connected. A current switching device having three terminal portions and a movable conductor that selectively connects the first, second, and third terminal portions is installed on the power source side and the load side of the electric device, and is movable during normal operation. By connecting the first and second terminals with a conductor, power is supplied from the power supply to the load side through the electric device, and when the electric device is removed, the bypass cable is connected to the third terminal, and then the movable conductor. To connect the first terminal and the third terminal to form a current path from the power supply side to the bypass cable to the load side to remove the electric device, and to attach the electric device to the second terminal. Electrical equipment It continued, and the movable conductor, the first
After connecting the terminal and the second terminal, by removing the bypass cable and forming a current path from the power supply side → electric equipment → load side, it is possible to remove or attach the electric equipment without interruption. is there.

According to a second aspect of the present invention, the first, second, and third terminal portions to which the power source side or the load side, the electric device, and the bypass cable are respectively connected, and the terminal portions are provided on their side surfaces. A tubular or prismatic hollow body mounted through the insulator and a hollow body, which are provided in the hollow body and are connected to the first, second, and third terminal portions, respectively, are insulated from each other. First, second and third fixed conductors,
A movable body, which is disposed movably in the longitudinal direction in the hollow body and has first and second movable conductors mounted on both sides of the insulating shaft in an electrically conductive state with each other; An insulating shaft attached to one end of the first or second movable conductor for moving the body in the longitudinal direction of the hollow body, and the first and second movable conductors of the movable body provide the first and second movable conductors. The fixed conductor or the first and third fixed conductors are selectively connected so that the electric device can be removed or attached without interruption.

[0008]

According to the first aspect of the present invention, when the electric device is removed, the bypass cable is connected to the third terminal, and then the first terminal and the third terminal are connected by the movable conductor, A current path from the power supply side to the bypass cable to the load side is formed to remove the electric device, and when the electric device is attached, the electric device is connected to the second terminal, and the movable conductor connects the first terminal to the first terminal. After connecting the 2nd terminal, the bypass cable was removed to form a current path from the power supply side to the electric equipment to the load side. Therefore, it is possible to attach and detach the electric equipment and attach and detach the bypass cable. It can be done safely in a line condition, and there is no need to have a power failure when removing and installing electrical equipment.

According to a second aspect of the present invention, in the uninterruptible current switching device, the first, second and third terminal portions are attached to an insulator made of a hollow body having a cylindrical shape or a prismatic shape, and the hollow body is formed. The first, second, and third fixed conductors connected to the first, second, and third terminal portions, respectively, and the first and second movable conductors are movable in the longitudinal direction of the hollow body. Since the movable body is provided, the first, second, and third terminals can be selectively connected by simply moving the movable body.
The current can be switched safely and easily in a live state.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a procedure for removing electrical equipment such as a PCT using the uninterruptible current switching system of the present invention. FIG. 1 (a) is a state during normal operation, and FIG. The bypass cable is attached to remove the electric device, and (c) shows the state where the electric device is removed.

In the figure, reference numerals 1a, 1b and 1c denote uninterruptible current switching devices according to the present invention. The uninterruptible current switching devices 1a, 1b and 1c are provided on the power source side and the load side, respectively. Each has three terminals,
Each terminal is connected to an electric device such as a power supply, a bypass cable, and a PCT. 2 is an object to be removed, for example a PC
T, and 3 is a bypass cable.

FIG. 2 shows an uninterruptible current switching device 1 shown in FIG.
It is a figure which shows the structure of a, 1b, 1c, and the figure has shown the state which attached the insulating cap to two terminals among the provided three terminals. In the figure, 11 is a cylindrical body formed of an insulator such as polyurethane, 12,
12 'is an insulating cap, 13, 13' and 13 "are insulating cylinders made of nylon or the like, 14 and 14 'are movable conductors, 1
5, 15 ', 15 "are fixed conductors, 16, 16' are insulating shafts made of nylon or the like, 17, 17 ', 17"
Is a movable conductor 14, 14 'and a fixed conductor 15, 15', 1
A multi-contact ram band for ensuring 5 "electrical contact, 18 is a handle, 21, 21 'and 21" are locking sockets.

In the figure, the movable conductors 14 and 14 ', the insulating shafts 16 and 16', and the handle 18 are integrally formed. By moving the handle 18 to the left and right in the figure, the movable conductors 14 and 14 'are formed. Insulation shafts 16 and 16 'are insulation cylinders 13 and 13' and 13 ", fixed conductors 15 and 15 'and 15"
The space formed inside is moved left and right. The figure shows a state in which the movable conductors 14, 14 'and the like are moved to the right side in the figure.

The movable conductors 14 and 14 'are electrically connected by a conductor penetrating the inside of the insulating shaft 16, and the movable conductors 14 and 14' are multi-contact ram bands 17, 17 'and 17 ". It is electrically connected to the fixed conductors 15, 15 ', 15 "through. Fixed conductor 1
5,15 ', 15 "are lock type sockets 21,2
1 ', 21 "are attached, and a cable or the like can be pulled out from the fixed conductors 15, 15', 15" by inserting terminals from the outside into the lock-type sockets 21, 21 ', 21 ". This figure shows a state in which the insulating caps 12, 12 'are attached to the lock type sockets 21, 21'.

FIG. 3 shows the lock type socket 2 shown in FIG.
It is a figure which shows an example of the terminal connected to 1,21 ', 21 ", The figure shows the terminal for bypass cable connection. In the figure, 31 is the lock type socket 2 of FIG.
1, 21 ', 21 "plugs, 32 heat shrinkable inter-terminal sleeves, 33 cable conductors, 34 sealing tape, 35 heat shrinkable tracking resistant tubes, 36 conductive paint, 37 Is semi-conductive tape, 3
8 is a shield copper tape, 39 is a ground wire.

In the figure, a cable conductor 33 is connected to the plug 31 by means such as crimping, and a sealing tape 34 and a heat-shrinkable inter-terminal sleeve 32 are provided thereon. The outer side of the terminal portion is covered with a heat shrinkable tracking resistant tube 35. FIG. 4 shows P shown in FIG.
It is a figure which shows the switching state of the uninterruptible current switching apparatus 1a, 1b, 1c in the removal construction of electric equipments, such as CT. The figure shows the uninterruptible current switching apparatus provided in the power supply side of FIG.

In the figure, the same parts as those shown in FIG. 2 are denoted by the same reference numerals, (a) of the figure is a state during normal operation, (b) is a state during switching, and (c) is ) Is a PC
The state at the time of T separation is shown. Next, with reference to FIG. 2, FIG. 3, and FIG. 4, the removal work of the electric device in FIG. 1 will be described.

During normal operation shown in FIG. 1 (a), the uninterruptible current switching devices 1a, 1b, 1c are in the state shown in FIG. 4 (a). That is, the handle 18 has been moved to the left side in FIGS. 2 and 4, and the current from the power supply side is the fixed conductor 15 →
It flows to PCT2 via movable conductor 14-> movable conductor 14 '-> fixed conductor 15'. At this time, the fixed conductor 15 "
Is in contact with the insulating shaft 16 'and is electrically disconnected.

When the PCT2 is to be removed,
In the state shown in FIG. 4A, the uninterruptible current switching device 1a,
By removing the insulating cap 12 attached to the lock type socket portion 21 of 1b and 1c, the bypass cap shown in FIG.
Insert the cable connection end into the lock-type socket provided on the fixed conductor 15 ", and connect the bypass cable 3 to FIG.
As shown in (b) and FIG. 4 (b), it is connected to the uninterruptible current switching devices on the power supply side and the load side.

Then, the handle 18 of the uninterruptible current switching device on the power supply side and the load side is moved to the right side in FIGS.
As shown in FIG. 4B, fixed conductors 15, 15 ', 1 connected to the power source side, the PCT side and the bypass cable side
5 "is electrically connected by the movable conductors 14 and 14 '.
At this point, the current flowing from the power supply to the PCT2 is transferred to the bypass cable side, and the line on the PCT2 side is in a no-load state.

Further, when the handle 18 is moved to the right side of FIGS. 2 and 4, the fixed conductor 1 connected to the PCT 2 side is moved.
5 ′ contacts the insulating shaft 16 and is electrically disconnected, and the current supplied from the power source flows to the bypass cable 3 through the fixed conductor 15 → movable conductor 14 → movable conductor 14 ′ → fixed conductor 15 ″. The uninterruptible current switching device on the load side is also switched in the same manner as above, and the current flowing through the bypass cable 3 is supplied to the load via the uninterruptible switching device on the load side.

As described above, with the line connected to the PCT2 side electrically disconnected from the power source, as shown in FIG.
Remove PCT2 as shown in. When the PCT2 is attached, the uninterruptible current switching device is operated in the reverse order of the above procedure to attach the PCT2, and then the bypass cable is removed. Incidentally, the movable body of the uninterruptible current switching apparatus of the above embodiment is provided with a means such as a stopper for restricting its moving range, or the uninterruptible current switching apparatus shown in FIGS. The uninterruptible current switching device shown in the above-described embodiment can be modified in various ways, such as being mounted on one box and configured so that the handle of each uninterruptible current switching device can be operated by one operating handle. .

Further, in the above embodiment, the PCT is shown as the electric device to be replaced, but the electric device targeted by the present invention is not limited to the above PCT, and other various electric devices can be used. It can be applied to replacement work.

[0024]

As is apparent from the above description,
In the present invention, a current switching device including a terminal portion to which a power supply side or a load side is connected to an electric device and a bypass cable, respectively, and a movable conductor that selectively connects the terminal portion is provided on the power supply side of the electric device. Installed on the load side,
By moving the movable conductor and selectively connecting between the above terminals, electrical equipment can be removed and installed, so work can be performed safely in a live state, and a power outage is required during construction. There is no.

Therefore, it is not necessary to carry out work on holidays as in the conventional case, an operator can be easily secured, and electricity of a power supply device having a load such as a computer which needs constant power supply is used. The equipment can be easily replaced.

[Brief description of drawings]

FIG. 1 is a diagram showing a procedure for replacing an electric device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an uninterruptible current switching device according to an embodiment of the present invention.

FIG. 3 is a diagram showing a bypass cable terminal according to an embodiment of the present invention.

FIG. 4 is a diagram showing a switching state of the uninterruptible current switching device.

[Explanation of symbols]

1, 1a, 1b, 1c Uninterruptible current switching device. 2 PCT 3 Bypass cable 11 Main body 12, 12 'Insulation cap 13, 13', 13 "Insulation cylinder 14, 14 'Moving conductor 15, 15', 15" Fixed conductor 16, 16 'Insulation shaft 17, 17', 17 "Multi-contact ram band 18 handles 21,21 ', 21" Locking socket

Claims (2)

[Claims] 1. A first, second, and third terminal portions to which a power source side or a load side, an electric device, and a bypass cable are respectively connected, and first, second, and third terminal portions are selectively formed. A current switching device equipped with a movable conductor to be connected is installed on the power supply side and the load side of the electric device, and during normal operation, by connecting the first and second terminals with the movable conductor, the power supply can be connected via the electric device. Power to the load side, and when removing the electric device, connect the bypass cable to the third terminal, then connect the first terminal and the third terminal with the movable conductor, and then connect the power supply side to the bypass cable. → A current path on the load side is formed to remove the electric device, and when the electric device is attached, the electric device is connected to the second terminal, and the movable conductor connects the first terminal and the second terminal.
After connecting the terminals of, the bypass cable is removed to form a current path from the power supply side to the electrical equipment to the load side, so that the electrical equipment can be removed or installed without interruption. Current switching method. 2. A first side, a second side, to which a power source side or a load side, an electric device and a bypass cable are connected, respectively.
A third terminal portion, an insulator made of a tubular or prismatic hollow body having the terminal portion penetrating its side surface, and attached to the hollow body. Mutually insulated first, second, and third fixed conductors respectively connected to the respective terminal portions of No. 3, and movably arranged in the hollow body in the longitudinal direction thereof, on both sides sandwiching an insulating shaft. , A movable body having first and second movable conductors mounted in an electrically conductive state with each other, and at one end of the first or second movable conductor for moving the movable body in the longitudinal direction of the hollow body. An insulating shaft attached to the movable body, and the first and second movable conductors of the movable body are moved to selectively connect the first and second fixed conductors or the first and third fixed conductors. And remove the electrical equipment uninterrupted or Ri with possible and to uninterruptible current switching device, characterized in that the.